On the table below, the level to trigger a toxic
algae Health Alert is 20 parts per billion
for the toxin Microcystin. Health Alerts stay in
effect until the level stays below 20 ppb for
two consecutive weeks

In the Bacteria (E.coli) column, a single sample
of 235 counts (or higher) per 100 ml
is considered a higher risk for illness through
ingestion